C# 如何在派生类中委托方法

2017-10-24 04:13:14 411 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

【Unity 16】 C# 接口，委托，匿名方法，Lamda表达式的定义及使用 PS:本系列笔记将会记录我此次在北京学习Unity开发的总体过程，方便后期写总结，笔记为日更。笔记内容均为自己理解，不保证每个都对。 C#笔记未按照难度排列 Part 1 接口接口定义了属性、方法和事件，这些都是接口的成员。接口只包含了成员的声明。成员的定义是派生类的责任。接口提供了派生类应遵循的标准结构。接口使得实现接口的类或结构在形式上保持一致。若在团队中，能够规范整个团队方法函数的命... 阅读详情

C# 小白,一个项目中遇到的问题:
这个例子是关于从派生类中调用的实现,虽然没实现.一个进度条,一个标签 ,一个按钮,完整(错误)例子如下

窗体:

System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Threading;



namespace WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        delegate void AsynUpdateUI(int step);



        public Form1()

        {

            InitializeComponent();

        }



        private void btnWrite_Click(object sender, EventArgs e)

        {

            int taskCount = 10000; //任务量为10000

            this.pgbWrite.Maximum = taskCount;

            this.pgbWrite.Value = 0;



            w2 dataWrite = new w2();//实例化一个写入数据的类

            dataWrite.UpdateUIDelegate += UpdataUIStatus;//**绑定更新任务状态的委托

            dataWrite.TaskCallBack += Accomplish;//**绑定完成任务要调用的委托



            //启动线程

            //Thread thread = new Thread(new ParameterizedThreadStart(dataWrite.Write));

            Thread thread = new Thread(new ParameterizedThreadStart(dataWrite.Write));

            thread.IsBackground = true;

            thread.Start(taskCount);

        }



        //更新UI

        private void UpdataUIStatus(int step)

        {

            if (InvokeRequired)

            {

                this.Invoke(new AsynUpdateUI(delegate(int s)

                {

                    this.pgbWrite.Value += s;

                    this.lblWriteStatus.Text = this.pgbWrite.Value.ToString() + "/" + this.pgbWrite.Maximum.ToString();

                }), step);

            }

            else

            {

                this.pgbWrite.Value += step;

                this.lblWriteStatus.Text = this.pgbWrite.Value.ToString() + "/" + this.pgbWrite.Maximum.ToString();

            }

        }



        //完成任务时需要调用

        private void Accomplish()

        {

            //还可以进行其他的一些完任务完成之后的逻辑处理

            MessageBox.Show("任务完成");

        }



    }

}

父类:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;



namespace WindowsFormsApplication1

{

    public class DataWrite

    {

        protected virtual void Write(object lineCount)

        {



        }

    }

}

子类 w2:



using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;



namespace WindowsFormsApplication1

{

    class w2 : DataWrite

    {

        public delegate void UpdateUI(int step);//声明一个更新主线程的委托

        public UpdateUI UpdateUIDelegate;



        public delegate void AccomplishTask();//声明一个在完成任务时通知主线程的委托

        public AccomplishTask TaskCallBack;



        protected override void Write(object lineCount)

        {

            StreamWriter writeIO = new StreamWriter("text.txt", false, Encoding.GetEncoding("gb2312"));

            string head = "编号,省,市";

            writeIO.Write(head);

            for (int i = 0; i < (int)lineCount; i++)

            {

                writeIO.WriteLine(i.ToString() + ",湖南,衡阳");

                //写入一条数据，调用更新主线程ui状态的委托

                UpdateUIDelegate(1);

            }

            //任务完成时通知主线程作出相应的处理

            TaskCallBack();

            writeIO.Close();

        }

    }

}